docs: add changelog

Author: kthy

CHANGELOG.md

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+# Changelog
+
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/), and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
+
+## [Unreleased]
+
+### Added
+
+…
+
+### Changed
+
+…
+
+### Removed
+
+...
+
+## [3000.0.0] - 2025-11-16
+
+Initial release.
+
+### Added
+
+Not applicable.
+
+### Fixed
+
+Not applicable.
+
+### Changed
+
+Not applicable.
+
+<!-- markdownlint-disable-file MD024 -->
+
+[Unreleased]: https://github.com/olivierlacan/keep-a-changelog/compare/v3000.0.0...HEAD
+[3000.0.0]: https://github.com/olivierlacan/keep-a-changelog/releases/tag/v3000.0.0